Önal, Zerrin, et al. “Evaluation of the Likelihood of Reflux Developing in Patients With Recurrent Upper Respiratory Infections, Recurrent Sinusitis or Recurrent Otitis Seen in Ear-Nose-Throat Outpatient Clinics”. The Turkish Journal of Pediatrics, vol. 57, no. 3, June 2015, pp. 258-65, https://doi.org/10.24953/turkjpediatr.2015.1234.